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MIF (ASC)
hirose.chiaki - 3:21 Thursday 26 December 2024 (32115) Print this report
Re-measurement of WFSf3 sensing matrix in PRFPMI

The clipping to the optical pass of WFSf3 was found in klog31986. So I try to check if the sensing matrix results have changed. I summarized the result. I will compare with the this result and the result of klog31003.

What I did.

  • In this time, the dof is DHARD, CHARD, CSOFT, DSOFT, PRM, PR3, PR2, IMMT1, IMMT2, ETMs COMMON and ITMs COMMON.
  • Because the FPMI actuator ratio had changed since the last measurement(klogc), I checked to confirm that the FPMI mirrors were all tilted to the same tilt at the dofs of FPMI (DHARD, CHARD, CSOFT, and DSOFT). Incidentally, the actuator ratios for each degree of freedom were set to the same ratio(FIG1), so I checked that for only CHARD.
    At this time, we found that only ETMY tilted 10 times more than the other mirrors.(FIG2) Ushiba-san and Yamamoto-san solved the problem(klog32129). As a result, I was able to tilt all four mirrors at almost the same angle.(PIT: FIG3, YAW: FIG4)
  • Actuator ratios for CHARD and DHARD are as in FIG1. Actuator ratios for CSOFT, DSOFT, ETMs COMM and ITMs COMM were temporarily set to SRC2 for excitation. (CSOFT:FIG5, DSOFT:FIG6, ITMs COMMON: FIG7, ITMs COMMON:FIG8)
  • I record this.(FIG9)
  • When measurement, I turned on "redG_measurement" filter like klog31126.
  • I uploaded this post on the result.(FIG9-) I will post comparative discussion.

Notes

  • (These are just notes.) The first schedule was to turn off the WFS control and take measurements.
    The LSC_LOCK guardian, PRFPMI_RF_LOCKED, automatically records the good_oplev of the mirror. (Recorded once at 5 minutes after locking, then updated every 10 seconds.) If you go through RESET_ASC_FEEDBACK after DOWN in LSC _LOCK guardian, good_oplev is offloaded to TM_OPLEV_SET in RESET_ASC_FEEDBACK. If we do it on the first schedule, we record the mirror good_oplev with PRFPMI_RF_LOCKED in the LSC _LOCK guardian and request ENGAGE_WFS_DCON in the LSC guardian to get into the DCcenteringloop. However, this time I measured at 6.125Hz and 13.125Hz, I kept all of WFSASC. Because WFS UGF is about 1Hz.
  • In the current LSC_LOCK guardian PRFPMI_RF_LOCKED, the DC centering loop of WFSf3 is also turned on.
  • The demodulation phase of each segments is Last FIG.
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Comments to this report:
hirose.chiaki - 17:11 Friday 14 February 2025 (32259) Print this report

Although very late, I summarized the cross-check of the December measurements and the comparison of the September(klog31128) and December(klog32115) measurements.

Did the cross-check for this measumerement.

As the cross-check of this measurement, I compared the plot from the Ushiba-san's script (klog31047) with the plot from my script.
These plots were plotted only for results what I phase and Qphase coherence both above 0.7.
At this time, the resulting plots were almost identical. So the data plottings seem to be correct. (FIG1, FIG2)

Compared the measurements between September and Decemeber.

I summurised the comparement between the september(klog31128) and this time(klog32115).
As for what has changed when compared to September and December, QPD3_RF11 phase was only rotated demodulation phase -95deg in klog31210.
Both measurements were plotted only for results what both I-phase coherence and Q-phase coherence were greater than 0.7.

The degrees of freedom plotted in both measurements had almost the same phase relationship between the degrees of freedom. 
The phase of each degree of freedom with high coherence was within ±35deg (≒arccos(0.8)).（FIG3, FIG4）
It is difficult to consider changes in the magnitude of each degree of freedom. The degree of freedom with the largest difference in measured values was 3.141 times. (klog32259.pdf)

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